Figure 3: Schematic diagram of electrochromic glass based on porous WO3 and multilayered structure. (a) An under layer of WO3 was first deposited on the ITO glass and then a metal W film on the WO3, (b) metal W film was used to form a porous WO3 of electrochromic film by anodization, and (c) the 144 cm2 electrochromic device includes a working electrode (ITO, WO3), ion conductor (electrolyte), and counter (Pt, NiO2, ITO).